Combined gear-muffler and shunt for magneto-generators.



No. 652,485. Patented June 26, I900. J. G. NULEN.. COMBINED GEAR MUFFLERAND SHUNT FOB MAGNETO GENERATORS.

(Application filed May 10, 1900.) V (No Model.) 2 Sheets-Sheet l.

lvd weoae:

hkmacb,

No. 652,485 A Patented June 26, 1900.

J. a. NOLEN.. COMBINED GEAR MUFFLER AND SHUNT FOR MAGNETO GENERATORS.

(Application filed May 10, 1900.) (No Model.)

2 Sheets-Sheet 2.

f T J12 i @p H 1 3 J lmwum wifueoua! Q E f ZM l v "I ",1...

I @L'Mak; I 6 Mom HE /l1 w: NORRIS PZTENS co, wore-Litre, WASHWGTON, ac.

UNITED STATES PATENT OFF-ICE.

JAMES G."NOLEN, OF CHICAGO, ILLINOIS, ASSIGNOR OF TW'O-THIRDS TO STANLEYA. DUVALL, OF SAME PLACE, AND BENJAMIN F. STEWART,

OF EVANSTON, ILLINOIS.

COMBINED GEAR-MUFFLER ANDSHUNT' FOR-MAGNETO-GENERATORS.

SPECIFICATION forming part of Letters Patent No. 652,485, dated June 26,1900. Application fild May 10, 1900. Serial No. 16,207. (No model.)

To ctZZ whom it may concern:

Be it known that I, JAMES G. NOLEN, a citizen of the United States,residing at Chicago, Cook county, Illinois, have invented certain newand useful Improvements in a Combined Gear-Muffler and Shunt forMagnetic Generators; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to an improved gearmuflier and shunt for telephonemagneto-generators and the like.

The object of my invention is to provide a mechanism by means of whichthe noise in the gear-driven magnetogenerator due to backlash will beavoided, while at the same time the mechanism used for this purpose willalso participate in the automatic opening and closing of a shunt-circuitaround the armature-coils of the generator.

With this general object in view my invention consists in the features,details of con- 2 5 struction, and combination of parts, which willfirst be described in connection with the accompanying drawings, andthen particularly pointed out in the claims.

In the drawings, Figure 1 is a side elevation 0 of a magneto-generatorembodying my invention in its preferred form; Fig. 2, an end elevationof the same; Fig. 3, a detail viewindicating the circuits; Fig. 4, aview of a part of the movable spring-arm; Fig. 5, a similar 3 5 view ofa modified form of spring-arm; Fig. 6, a detail view, in side elevation,showing the gear-muffling mechanism in position for assembling; Fig. 7,a side elevation of a generator, showing the shunt-circuit opened; Fig.

0 8, a similar View of a modified form of myinvention and Fig. 9,adet'au perspective view of the end of the armature-shaft, the sleeve,and the pinion.

Referring to the drawings, A is a magnetogenerator provided with a crankA, fixed to the end of a crank-shaft A mounted in bearings a a inthegenerator-frame. Upon this crank-shaft is secured a gear-wheel A Thegenerator has its armature-shaft A extended at one end, said end beingpreferably reduced in diameter and provided with a radial pro jection apreferably in the form of a feather or spline, as shown in Figs. 6 and9. This spline is located somewhat inward from the end of thearmature-shaft, and on that por- 5 5 tion of the shaft which projectsbeyond the spline is loosely mounted a pinion B, which has aninward-extending projection b, preferably V-shaped, the said pinionmeshing with the gear-wheel A The pinion is held on the shaft by awasher Z), secured to the end of the shaft A by a screw b j Theprojection b on the pinion enters a correspond ingly-shaped groove in asleeve C, which is movably mounted on that part of the arma+ ture-shaftwhich is provided with a spline, the said spline being received in a keyway or slot 0, Fig. 9, in said sleeve. The inner surface of the sleeveis in contactwith a washer C, which bears against the end of a movablespring-arm D, which arm has one end secured to and in electricalcommunication with the generator-frame. O ver this fixed 'end of saidspring-arm D is secured a fixed contact sprin'g D, which is insulatedfrom the spring-arm D by a layer of insulating material, as indicated atd, the said contact-spring D having a contact-point d, arranged tocontact with the spring-arm D when the latter is in its normal position.

The end of the spring-arm D which bears against the sleeve C may beforked to receive the armature-shaft A, as shown in Fig. 5, orpreferably may have an eye formed thereon, through which the shaftpasses, as is shown in Fig. 4.. v v

Inside the movable spring-arm D is located a helical spring E,surrounding the arm ature shaft A", which spring assists the spring-armD in pressing the sleeve Coutward. v

The end of the armature-shaft A which is opposite the driving mechanismis provided with a pin F, insulated from said armatureshaft andconnected to one end G of the armature-winding, the other end GA ofwhich winding is connected to the armature-shaft in the usual way. Thepin] F is insulated from the armature -shaft A in'an'y' desired1nanneras, for example, by driving it into a hole in a bushing g, ofvulcanite or the like, Fig. 3, which bushing is inserted in a hole inthe end of the armature-shaft. A spring H is arranged to bear againstthe pin F, said spring being insulated from the generatorframe, as shownin Fig. 1.

The generator frame is provided with a binding-post I, Fig. 7. The saidbindingpost and the spring II form the two terminals of the apparatus.The spring II is connected by a conductor h to the fixed contactspringD.

The manner of connecting the generator with the line being well knownneed not be described.

The operation of this apparatus is as follows: When the generator is notin operation, the sleeve G is held at its extreme outward position bythe resiliencies of the movable spring-arm D and the coiled spring E. Inthis condition the contact-point d of the fixed contact-spring D touchesthe outer face of the movable spring-arm D, whereby the circuit from thelines is closed not only through the armature-coils in the usual way,but also through the spring-arm D, contact-point cl,

fixed contact-spring D, conductor h, and contact-spring II, theshunt-conductor It being in parallel with the armature-coil. Theresistance of this divided path is therefore very low. When the crank Ais turned to operate the generator, the initial rotation of thegearwheel A causes the pinion B to rotate, and the sleeve 0 is movedlongitudinally inward against the action of the movable spring-arm D andthe coiled spring E, thisinwardmovement of the sleeve 0 being due to thefact that the inclined surfaces of the projection b on the pinion actingagainst the corresponding inclined surfaces of the groove in the end ofthe sleeve translate the movement of rotation of the pinion B into alongitudinal movement of the sleeve 0. This movement of the sleevecauses the spring-arm D to leave the contact-point cl, thus opening theshunt-circuit through the conductor h, as will be understood from Fig.7. As the sleeve 0 moves inward the resiliency of the spring becomesgreater and finally prevents the further inward movement of the sleeveat such a point that the sleeve is still in engagement with the featheror key a whereupon the rotation of the pinion 13 produces rotation ofthe armature-shaft, and thus causes the generation of electricity in thearmature-coil. As the shunt is open at this time, the current ofelectricity is sent out on the line. WVhen the operation of thegenerator is stopped, the spring-arm D, assisted by the coiled spring E,forces the sleeve 0 outward into its normal position, at the same timeclosing the shunt-circuit by coming into contact with the contact-pointd.

It will be noted that during the operation of the generator theresiliencies of the spring arm D and of the coiled spring E keep acertain amount of yielding pressure on the pinion in a directionopposite to that in which it is being rotated. Hence all backlashbetween the pinion and its gear-wheel is taken up, and thereby allrattling is avoided and the noise of operation of the gear and pinion isreduced to a minimum.

In Fig. 8 I have shown a modified form of my invention, which differsfrom that previously described only in having the spring contact-arm Dand the fixed contact-spring D located above the armature-shaft insteadof below it.

Referring to the preferred form of springarm D, (shown in Fig. 4,) it isto be noted that as the end of the said spring-arm encircles thecrank-shaft the pressure of the sleeve 0 is brought upon the end of thespring in an even manner, and at the same time all twisting of thespring is avoided. It will be noted that the said spring D, whether madein the form shown in Fig. 4 or that shown in Fig. 5, not only performsits function of closing the shunt circuit, but also acts to assist thespring E in returning the sleeve 0 to its normal position.

In addition to the above advantages it will be seen that but twocontact-springs are necessary with my constructiomand these springs areso located as to be easily attached and readily accessible.

It will be seen that the inclined projection b on the pinion B and thecorrespondinglyinclined rentrant surfaces on the sleeve 0 form what maybe termed cam-surfaces, and these cam-surfaces together form a camdevice, which, in combination with the sleeve 0, the spring E, and thespline a forms a flexible connection between the armature-shaft and thepinion B, which also acts as a backlash device. Of course the spring-armD may be employed alone as the spring device for pressing the sleeveoutward; but in order not to unnecessarily wear out the spring D thecoiled spring E is preferably employed also.

Having thus fully described myinvention, what I claim as new, and desireto secure by Letters Patent, is-

1. In a magneto-generator, the combination with an armature-shaft, andmeans for rotating the same, of a backlash device intermediate saidrotating means and the armatureshaft, and a circuit-breaking deviceoperated by the backlash device.

2. In a magneto-generator, the combination with a gear-wheel and meansfor rotating the same, of a pinion driven by said gear-wheel, anarmature-shaft, a flexible connection between said pinion and thearmature-shaft, and a circuit-breaking device operated by the flexibleconnection.

3. In a magneto-generator, the combination with a driving-wheel, andmeans for rotating the same, of a driven wheel loosely mounted on thearmature shaft, a sleeve longitudinally movable on the armature-shaft, acam device intermediate the driven wheel and the sleeve and means foryieldingly pressing the sleeve toward the driven wheel.

ICO

IIO

able spring' arm provided with an opening at one end into which entersthe armature-shaft, and a coiled spring encircling the armatureshaft andarranged to press the spring-arm and sleeve outward, of a fixedcontact-spring arranged to engage the spring-arm when the latter is inits outward position.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES G. NOLEN.

WVitnesses:

G. A. PATTERSON, M. E. BUEHRLE.

